I think VirtualHere will allow you to share an Xbox controller over a network
Best posts made by evilC
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RE: Use tablet touchscreens as the DS4 touchpad
UCR might be able to do this (As and when Nefarius adds the API end-points for outputting to DS4 touchpad).
We have an Interception provider for keyboard and mouse, which supports absolute mouse input. This may work with the touchscreen, not sure if you will get multi-touch, but I don't think you want that?